Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5c41669a682258…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 11:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2bcc1e85c0c14fd4bb0288434e4fe2d8 SHA-1: 5788ac03f4c0e0e877175230b8c4f465949d696c SHA-256: ad5c41669a682258f62aca4bf4c1ee0a365578d63ab945d88385e3a52b2cfc0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7t2nrkkjhlpu2b7bamd75q1lel/99961641703.pdf In PDF document text
    • http://fd-health.com/upload/ckeditor/files/80140099663.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/ravasobifozixibazaw.pdfIn PDF document text
    • http://leeandrewdavison.com/download/33598900283.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcdf0f3149---35831665372.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202110020818443805.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guguzu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee44c8963---ludipu.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/87988388358.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/86096691485.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/xemitikezoki.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/natonozonikarobatowa.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/78470830566.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/59107610239.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/99321055897.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/3210349203.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16157fa79e330e---gabajovegedopovimaweka.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/33757233805.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/besimatutik.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/5609976504.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/32992280704.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/mipujuvusatewozebuf.pdfIn PDF document text
    • http://theponghop.com/upload/files/19348339169.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155f89a3b8c0---85651251674.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/nulefevarelovosifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chest+thorax+ct+scanPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 10320 bytes
SHA-256: 69c22a2ac1f5b4d3ddd7f0352e57d41cfbd6ed65c32f45a3d2b95a3e4565af5e
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 15144 bytes
SHA-256: 195a0c0d8f6aceed0b8f4950d6322edb6db1cf9dbd177ce5dbb3a4e4aa073178